336 PYKENOCAEPEI [POKESA 



■va,T. fusiformis). Sagedia Harrimanni Koerb. Syst. Idch. Grerm. 

 p. 362 (1855). 



Exsicc. Mudd n. 288 (as A. macidaris) ; Leight. n. 138 (as 

 V. codonoidea) ; Larb. Lich. Hb. n. 197 (as V. Harrimanni), 

 without number. 



The tjrpe specimen of V. perminuta in the British Musevma 

 has 4-eeUed spores, and is otherwise similar to P. chlorotica. 

 Several species or varieties have been founded on slight differences 

 of perithecia and of the thaUus, which varies from greyish-green 

 to dark-brown in colour. The specimen of Vemtcaria trachona 

 from Acharius in the possession of the Linnean Society is a 

 spermogonial form, possibly of P. chlorotica. In the Sowerby 

 herbarium there is a specimen of P. chlorotica from Miss Hutchins, 

 the original collector of V. trachona in Ireland, but the specimen has 

 been labelled by Borrer as Vemtcaria viridula, and does not altogether 

 correspond with the one figured in Engl. Bot. 



Hab. On rocks. — Distr. Not uncommon in the Channel Islands, 

 England, Wales, and Ireland ; not recorded from Scotland. — B. if. 

 Jerbourg, Guernsey ; Boulay Bay, La Coupe, Bozel and Trinity, Jersey ; 

 Withiel, Cornwall ; Torquay, Devon ; Bathford Hill and Weston-super- 

 Mare, Somerset ; Bamsley Park, Gloueesterslure ; Haughmond Hill, 

 Shropshire ; Bettws-y-Coed and Trefriw, Camai-von ; Buxton, Derby- 

 shire ; BUsdale, near Ayton, Cleveland, Yorkshire ; Blackwater and 

 Derriquia, Killarney, Kerry ; Kylemore, near TuUy, Doughruagh and 

 Glen Tuagh, Connemara, Gal way ; Cliffe of Moher, Clare. 



Var. persiclna A. L. Sm. — Thallus whitish or sometimes rose- 

 coloured or purplish-red. Spores more obtuse at the ends than 

 in the species. — Verrucaria linearis Leight. Angioc. Lich. p. 52, 

 t. 23, fig. 1 (1851) A Lich. Fl. p. 441 ; ed. 3, p. 475 ; Cromb. 

 Lich. Brit. p. 116. V. chlorotica i. persicina Xyl. in Maine et 

 Loire Mem. Soc. Acad. iv. p. 36 (1858). Sagedia persicina 

 Koerb. Syst. Lich. Germ. p. 364 (1855). Arthopyrenia linearis 

 Mudd Man. p. 300 (1861) e descript. 



Leighton (Angioc. Lich. p. 52) refers to this variety as the small 

 lichen figured along with V. Dufourii in Engl. Bot. Suppl. t. 2791. 



Hai. On calcareous rocks. — Distr. Bare in X. and S.W. England 

 and W. L-eland. — B. if. Woodale, Buxton, Derbyshire ; in a cave, 

 Derryclaje, near Kylemore, ConneTnara, Galway. 



8. P. tenuifera A. L. Sm. — Thallus dark-grey or blackish, 

 thin, continuous or cracked. Perithecia minute, black, hemi- 

 spherical with a minute ostiole ; perithecial wall dimidiate ; 

 paraphyses slender, distinct ; spores colourless, elongate-acicular, 

 3-septate, 0,029—35 mm. long, 0,003—4 mm. thick. — Vemtcaria 

 tenuifera Nyl. in Flora lix. p. 237 (1876) ; Cromb. in GreviUea v. 

 p. 29 ; Leight. Lich. FI. ed. 3, p. 476. V. pertenuis Leight. in 

 Trans. Linn. Soc. ser. 2, i. p. 239, t. 32, fig. 20 (1878) & Lich. FI. 

 ed. 3, p. 476. 



There is no specimen of V. tenuifera in the British Museum, 

 but Larbalestier states that the specimen of V. pertenuis, collected 



